What nobody knew at the time was that the ThinkPad name, design aesthetic, and emphasis on technological innovation in the service of reliable productivity would have such staying power. Any citizen of late 1992 who encountered a modern ThinkPad such as the X1 Carbon would likely be blown away by the machine’s thin-and-light form factor–less than a third the thickness and weight of the 700C–and high-resolution screen, and would certainly be confused by it carrying a Lenovo nameplate rather than that of IBM. (The Chinese manufacturer acquired IBM’s PC business in 2005.) But if that person was familiar with the ThinkPad 700C, identifying the X1 Carbon as a ThinkPad would be easy. You can’t say anything similar about a 1992 Apple PowerBook and a 2017 MacBook.
I had a Thinkpad for a number of years. It was a good laptop until the case started to fall apart. I liked how standardized the machines were and easy/inexpensive to get parts, and how you could customize them to your hearts delight. Great machines for running Linux on for sure!